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Analizowano wpływ zawartości mikrosfer glinokrzemianowych (10–50% mas.) na proces spieniania oraz wybrane właściwości sztywnych pianek poliuretanowych (PUR) oraz poliuretanowo-poliizocyjanurowych (PIR). Otrzymane zmodyfikowane pianki PUR i PIR analizowano pod kątem ich zastosowania jako materiałów termoizolacyjnych. Wyznaczono m.in. wpływ zawartości mikrosfer na współczynnik przewodzenia ciepła, wytrzymałość...
The article is an analysis of nasal vowels in Polish letters from the first half of 16th century. Three subjects are discussed: the asynchronous and synchronous realization of nasal vowels in a position before a consonant, the asynchronous realization of back nasal vowels in final sound and the differentiation of timbre of nasal vowels from the 16th century. The asynchronous realization before a consonant...
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